Modify the function in Example 8.1 so that it becomes f(x) = x sin(x) for 0 ≤ x ≤ 30. Plot a lot of points from 0 to 30 to see what the graph of this function looks like. Then use GRG Nonlinear Solver to find its maximum. Try the following starting points: 1, 6, 15, 20, and 27. Report what you find. Then try Evolutionary Solver. Does it find the correct solution?